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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

</body>
<script>
    var data = { user: 'a123123', pwd: '113123', email: '123123@qq.com', phone: '17386141517' };
    // 得到  "user=a123123&pwd=113123&email=123123@qq.com&phone=17386141517"

    var list = [];
    for (var key in data) {
        var val = data[key];
        var item = key + "=" + val;  // "user=a123123"
        list.push(item);
    }
    console.log(list);

    data = list.join("&");

    console.log(data);




</script>

</html>